(change-log-version-number-regexp-list)

(change-log-version-number-regexp-list)
(change-log-version-info-enabled): Change :version to 21.1.
(toplevel): Require CL when compiling.

(change-log-version-number-regexp-list): Added tag
:version 20.6
(change-log-version-info-enabled): Added tag :version 20.6

More general version number search with
user-configurable regexp list.
(change-log-version-number-regexp-list): New user variable.
(change-log-find-version): Rewritten.  Use user-configurable
version numbering regexp list
change-log-version-number-regexp-list.
(change-log-find-version): Renamed to
change-log-version-number-search
(add-log-file-name-function): New.
(change-log-search-vc-number): Added END paramaeter.  Added doc
string to function.
(change-log-version-rcs): Renamed.  Was
change-log-search-vc-number.